Materials Selection Process

Phase 1 – Eliminating factors
Self welding: yes/no – except blades
Machining: yes/no
Larson Miller Parameter: 25 or higher for HP components

Phase 2 – Performance ranking
Cost of material
Oxidation
Yield Strength unless we can find a critical value
Fatigue?
Ductility/toughness?

Phase 3 – Thermal Matching
Weldability to other components